Unexpected error in v5.6 on 'New Prototype' and blank page on "Simulate"

I'm getting a "Unexpected Error occurs. We'll fix it in the next update." message when I try to create a New Prototype, on my MacBook Pro. I have the latest version 5.6 of Prototyper Pro. Also, since this last update, when I "Simulate" my prototype, it shows a blank page on the browser. Please help.